Improvement in packings for hydrants, pumps



UNITED STATES ATENT QFFICE.

JOHN W. MURPHY, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN PACKINGS FOR HVDRANTS, PUMPS, &c.

Specication forming part of Letters Patent No. 142,264, dated August 26,1873; application iled June 3, 1873.

To all whom it may concern:

Be it known that I, JOHN W. MURPHY, of the city of Baltimore and Stateof Maryland, have invented a new and Improved Packing for Hydrants,Pumps, Sac.; and I do hereby declare the following to be -a full, clear,and exact description of the same, reference being had to theaccompanying drawing forming a part of this specification, in whichoFigure lis a sectional elevation of a hydrant to which my invention isapplied, and Fig. 2 is a similar elevation of a fragment of adoubleacting pump.

The invention consists in a peculiar form of packing for pistons orother reciprocating rods,

as hereinafter specified and pointed out in the claim.

In the drawing, A represents a hydrantplunger, and B the cylinder inwhich it moves, while C is my improved packing, made of rubber, andprovided with the downwardly-projecting flange c. The latter iscylindrical on the inside to correspond with the aperture of the mainbodyT of the packing, andwith the circularity of the plunger A, butconical on the outside face. The ei'ect of the construction of thepacking is that as the piston ascends, creating a vacuum behind it, thewater presses against the outer conical surface of the ange c, and packsits inner surface closely against the piston-rod', but when the pistonis descending with its valve open no such close packing is required,andno such effect is produced. This packing may be used double or treblefor some purposes.

In Fig. 2 of drawing, G G representl two of my packing-rings placed withtheir solid rings face to face, while above them is a third "one, withits flange projecting downwardly.

Between the two outer rings U is an annular ring, E, which spaces andholds them apart. F is the cylinder, on which works piston G, and H thepackin g-chamber. In this case the object is to pack the piston-rod Gduring both the up and down strokes. In order to accomplish this with adouble-actin g pump the piston G moves up and causes the water to howthrough hole h into chamber H, when the angeof the inner packing-ring ismade to hug the rods G' tightly. On the other hand, when piston G movesin the opposite direction the water in front oi' the piston is admittedby a pipe, f, and a hole, e, against the anges of the oppositely-placedrings, or against that of one of them. This has the sameleftect asbefore, of compressing the ian ge or ian ges of my packing closely aboutthe piston-rod G.

I am aware that the use of liuids for packing, and of rubber rings forthat purpose, are old and well known to the public; butv What I doclaim, and desire to secure by Letters Patent, is

' The packing-ring O, cylindrical on the inside, and having a flange, c,tapering on the outside, as and for the purpose described.

JOHN W. MURPHY.

Witnesses L. C. HEATH, ALBERT SHARE.

